So, I agree with him. A "church" constituted by pedobaptists is no more a true church of Christ than if a group of Hindu's constituted it and called it a "church of Christ."
If the pedo-baptists are truly saved then the Holy Spirit indwells them. Not so of the Hindus.
If the pedo-baptists are truly saved then they belong to Christ and are part of his body. Not so with the Hindus.
When Christ returns, the pedo-baptists will be part of those who are gathered to Him, not so with the Hindus.
For these reasons and more, the pedo-baptists are a church--a church with error, but a church nevertheless. They are a church because they are a group of believers who have gathered together to worship, to fellowship, to edify the saints, and to evangelize the lost. They are my brothers in Christ though I will say to them directly that they are disobedient in the area of baptism. They have very little in common with Hindus.